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Eu3+ 농도가 적주황색 형광체 Gd1-xPO4:Eux3+의 발광 특성에 미치는 영향

Effects of Eu3+ Concentration on the Photoluminescence Properties of Red-orange Phosphor Gd1-xPO4:Eux3+

  • 조선욱 (신라대학교 전자재료공학과)
  • Cho, Seon-Woog (Department of Electronic Materials Engineering, Silla University)
  • 투고 : 2011.10.13
  • 심사 : 2011.10.31
  • 발행 : 2011.11.27

초록

Red-orange phosphors $Gd_{1-x}PO_4:{Eu_x}^{3+}$ (x = 0, 0.05, 0.10, 0.15, 0.20) were synthesized with changing the concentration of $Eu^{3+}$ ions using a solid-state reaction method. The crystal structures, surface morphology, and optical properties of the ceramic phosphors were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), and photoluminescence (PL) spectrophotometry. The XRD results were in accordance with JCPDS (32-0386), and the crystal structures of all the red-orange phosphors were found to be a monoclinic system. The SEM results showed that the size of grains increases and then decreases as the concentration of $Eu^{3+}$ ionincreases. As for the PL properties, all of the ceramic phosphors, irrespective of $Eu^{3+}$ ion concentration, had orange and red emissions peaks at 594 nm and 613 nm, respectively. The maximum excitation and emission spectra were observed at 0.10 mol of $Eu^{3+}$ ion concentration, just like the grain size. An orange color stronger than the red means that $^5D_0{\rightarrow}^7F_1$ (magnetic dipole transition) is dominant over the $^5D_0{\rightarrow}^7F_2$ (electric dipole transition), and $Eu^{3+}$ is located at the center of the inversion symmetry. These properties contrasted with those of a red phosphor $Y_{1-x}PO_4:{Eu_x}^{3+}$, which has a tetragonal system. Therefore, we confirm that the crystal structure of the host material has a major effect on the resulting color.

키워드

참고문헌

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피인용 문헌

  1. vol.22, pp.3, 2012, https://doi.org/10.3740/MRSK.2012.22.3.145
  2. Phosphors vol.24, pp.7, 2014, https://doi.org/10.3740/MRSK.2014.24.7.339
  3. Phosphors vol.24, pp.9, 2014, https://doi.org/10.3740/MRSK.2014.24.9.469